/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.lsm.context.requestcontext;

import org.apache.iotdb.lsm.response.IResponse;
import org.apache.iotdb.lsm.strategy.IAccessStrategy;
import org.apache.iotdb.lsm.strategy.PreOrderAccessStrategy;

/**
 * represents the context of a request
 */
public class RequestContext {

    // memory Structure Access Policy
    IAccessStrategy accessStrategy;

    // the tree level of the currently pending memory node
    int level;

    // the maximum level of memory nodes that can be processed
    int levelUpperBound;

    // response, encapsulating the response value and exception information.
    IResponse response;

    public RequestContext() {
        // preorder traversal strategy is used by default
        accessStrategy = new PreOrderAccessStrategy();
        level = 0;
        levelUpperBound = Integer.MAX_VALUE;
    }

    public void setLevel(int level) {
        this.level = level;
    }

    public int getLevel() {
        return level;
    }

    public IAccessStrategy getAccessStrategy() {
        return accessStrategy;
    }

    public void setAccessStrategy(IAccessStrategy accessStrategy) {
        this.accessStrategy = accessStrategy;
    }

    public int getLevelUpperBound() {
        return levelUpperBound;
    }

    public void setLevelUpperBound(int levelUpperBound) {
        this.levelUpperBound = levelUpperBound;
    }

    public <R extends IResponse> R getResponse() {
        return (R) response;
    }

    public <R extends IResponse> void setResponse(R response) {
        this.response = response;
    }

    /**
     * get the result of the response
     *
     * @param <T> type of the result
     * @return response result
     */
    public <T> T getValue() {
        return (T) getResponse().getValue();
    }

    /**
     * set the result of the response
     *
     * @param value response result
     * @param <T>   type of the response result
     */
    public <T> void setValue(T value) {
        response.setValue(value);
    }

    /**
     * If an exception needs to be thrown during the processing of the request, this method can be
     * used to accept the exception
     *
     * @param e Exception
     */
    public void thrownException(Exception e) {
        response.addException(e);
    }
}
